The "Package API" is the set of COM interfaces exposed in the Visual Studio SDK. These are the raw extensibility interfaces for the Visual Studio shell. Almost all the interfaces start with 'IVs' (for example IVsShell, IVsHierarchy, IVsSolution, etc...) If you have the Visual Studio 2010 SDK installed, take a look at the contents of %SDKInstall%\VisualStudioIntegration\Common\IDL for more detail.
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